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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ramault, Carla
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Topics
Publications (9/9 displayed)
- 2010Composite material characterization through biaxial testing of cruciform specimens
- 2010Numerical failure analysis of composite structures
- 2009Biaxial Failure Envelopes for Glass Fibre Reinforced Composite Laminates
- 2008The Influence of Biaxial Stress States on the Stiffness of Glass Textile Reinforced Cementitious Composites
- 2008Biaxial Mechanical Fatigue using Cruciform Composite Specimens
- 2008Biaxial testing of fibre reinforced composite laminates
- 2007Experimental and theoretical study of the damage onset in biaxial cruciform specimens under static and hysteresis loading
- 2007A Review Of Biaxial Test Methods For Composites
- 2007Towards the characterisation of biaxial material performance
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document
Experimental and theoretical study of the damage onset in biaxial cruciform specimens under static and hysteresis loading
Abstract
In this paper an attempt is made to prove that the load level at which failure is initiated in a biaxial loaded specimen is very close to the actual failure load. The digital image correlation method and the finite element method, in combination with the ultrasound phased array technique, are used to get a better understanding in the onset of the failure mechanisms in fibre reinforced plastics (FRP) such as glass reinforced epoxy. It is shown that the failure mechanisms of these FRP, with a specific stacking sequence that is widely used in the windturbine industry, start in a very late stage, approximately around 80% of the failure load, regardless of the fact that the load distribution is applied in one or two directions. No large difference is observed in the damage initiation load for a linear increase of the applied load compared with a hysteresis loading approach. Through implementation of the problem in a finite element model, it is shown that the digital image correlation results correspond very well with the numerically found strain fields. The ultrasound scans made of the central milled out zone do not expose large differences with a scan of an unloaded specimen. This confirms the conclusion of the late onset of damage during a loading cycle and leads in this way to very sudden failure of the specimen in the last 20% of the failure load.